Dark Satellite is a term used in the teachings of the Brotherhood
of Luxor, and occult associations derived from it, pertaining to and invisible
"semi-spiritual" planet. The Dark Satellite is a place where souls,
who have failed to make contact with their higher selves and gain immortality,
sink gradually into oblivion. The exact location is dubious and varies in
different presentations, but it is sometimes associated with the shadow
cast by the Earth in space.

The "ruling spiritual hierophant" of the Dark Satellite is
named Ob, and its influence is thought to be
the power for the Black Lodges. A.G.H.

Source:

Greer, John Michael. The New Encyclopedia of the Occult.
St. Paul. MN. Llewellyn Worldwide. 2005. p. 125